Many mountain communities around the world have promoted ecotourism ventures to ameliorate problems of environmental degradation and underdevelopment. Although there is no agreement on what ecotourism is or should be, it is generally believed that this form of tourism in the mountains will foster responsible tourist behavior, conservation of important wildlife habitats and ecosystems, appreciation of local cultures and traditional lifestyles, and provision of sustainable forms of livelihood for people living in remote areas and communities. The present article provides a brief overview of the trends in mountain ecotourism in developed and developing countries, concluding with a proposed framework for designation of mountain ecotourism sites.